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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77898915e9c175377e110580118be59505bc26313db18729aa2d1147c2bd4b92' 
  AND token = 'q0VtaBciMDgWAwIWGOw9gx7rFdYE/EwhWX8/DprUZdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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