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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b4a06b7817a01015c0113418ba0cdc71a14d66266d5164000c2e2c7e236664c' 
  AND token = 'V9VCcL5Lzqa0Z2cu2Rj7GX1qEbgjbpZF7NIEn+tSJaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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