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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbd9ca40c01b1d6ac4aa3fce5051f7e286eb5f0d2b43d7962980ef294a9e918a' 
  AND token = 'k3O5SJHMg/oZtNHqUX1T4XTX23kM4e5+kLYPqj1jfXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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