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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ee4e19a024f38755d7b41bda1a45c3a0ffc21d85ee5517aec67e53d798e2528' 
  AND token = 'EwkEqHf1qXEQlBjrJyJBz51hhjyAMpTqBETwkAnN5c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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