SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '628770975022b51af78b07abcd7d6305c1254b78b894adc2f02f0d5c95c7c22c' 
  AND token = 'KRovW1zYmWU+fsV9tJf5XXwLgVp5ngb3A+qchWvhEoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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