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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91affaa7ec7e7c3811ce727dd97645ed1937d8fc7d9191a2eca2d0b7ed646d5a' 
  AND token = 'qBD9CSXn1F4XNt/5L97ypFeIlDaI4oYuN6VHhmO2s44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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