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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0fd7cb9a09b0ae5b335fd52e1ae3efddb102d674bb7500bf7795f2e04844eba' 
  AND token = 'cJvpGw/twFOVLYQ1A8IrVfpLWVPI8PR5V/osEbt7HDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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