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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e83a332a53db980e56ce513be6214a51588e0ed811d7a925a5f3ef014b9a32b6' 
  AND token = 'oaFaXSKTkCIu2HpB2ZAopmukXF6oE0W4ynR9oxoCUZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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