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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30b0f9dffea66cbbf820e8052d6c1d523a5173b3a3ad9c768304ceceab857405' 
  AND token = 'XE5qyqesxoe9KJJEYxovUjflPs+m4bDRtTaeNIraP90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}