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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'febd027441d63165b34c06049c87ab80d2246e0ba35ab8560b61f47d24d97451' 
  AND token = 'iJ/+2SckugMtSF3zB1zBFM3Wu3eTXyBd+x40ms07QAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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