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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecb890e12673efebd6bb9955b65544be60a37f2191f1388fc518fcdb686e59ac' 
  AND token = 'T1ovhb8+LAxWZchEiJcAKssHsHKJPhLY0KbAWRBcFsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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