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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54f360a6f3541f2f268856f60ff3a0b8a6bedfdc48a34d685b57c420b84257af' 
  AND token = 'ShLOIin9dy6IROMetkN6pAJOGrQA00XYq47xaRKVU3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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