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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78c36623330c10ef9363319a51b4a295834593a7204e484873915f47f519e96b' 
  AND token = 'DDpypCk2ogQxBV3RPf8FFY0c3jARecuqtOLnY6l8NSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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