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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db2f9e79586a697122503211964ba82df02ff07e92171d79972ad314c3c46c40' 
  AND token = 'a16bhlk+32jokIXhSf2UIr+iQgdcWNyWpURngU4XkEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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