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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67126c8f087f3fef195ac60feb2e4796bfa630a98f14749b2b4a96271fe8b5ff' 
  AND token = 'UDH6Xte4PhTDaRUNO6Bkr3rvhLHO1R9XxEL4k0fnO5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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