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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '308fb32d8a1e2da864cab21586ac90973f2c1be7b8cf8a38c5b8c2288900c907' 
  AND token = '+2BqniPxyGub2xTbIG1UP0P/Zvr2lP/2Aqua8znC2UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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