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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f816bc9aa18fd291511c62d1f8c6e206ff8371c6217bec1104bb229e039591ef' 
  AND token = 'VIV7Mk4oBC07idpirnSZ/+4ZwYhi39RnKrxwBc1U1g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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