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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d0c56f2f5d7100b476ebae5bb70f6fa2dc45ca05938161aa5ad45e22d478279' 
  AND token = '9mWPSQt8XNEY02KmsMmprA1S1uOAfKzghHPmI6vmvQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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