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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ad7daec5b60865cc008091ac2918bc8df89f48bce31874970acbbcda1015077' 
  AND token = '2tjv8PHOtb6vgNTy8ojuRTKZJG0Si7Km1eKusjKhHxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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