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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18c7897dafad60faaf64061284d73ab63248e9ac6b5606e6639eccb5d8b3ff09' 
  AND token = 'ZMNlx70bVeDSn+kXeJV0yUn29JZ0SwRov/k+tZ852oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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