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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b76db11b99589f6caaf3dcd02a278d4f665126f220b082f36e71f8018d26f027' 
  AND token = 'lZFWCDN5LqR4ursFM9n4Ncrm2UbmRk4m7eCeshV9Dgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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