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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddf3e899cdb81d3598b0d82e6579ca7cfd67766485555546a80d148a3ec05784' 
  AND token = 'iOFXKtBw91CKKGpSerW5yvTB0XiiathmsVRk8bvQyYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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