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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ada1854a13b7563bcc001c4a21ab52d5c684368f9e3fde69222ccac34f4cc2a' 
  AND token = 'y5xf12fRrGlm/fL27URsQcYneLq5OIvwf2rgwfdrM0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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