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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a352057560c9566d95f48923ff698d74c2dfcfab0a90678381e13014a5976b8' 
  AND token = '9HcveROXwn9YsNSBW5uzcNSrwcXB/iPoxj6U7pruz2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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