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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e626c9c2af791dfc519f8ad9ecc328dd36e914f165f70e9a2a8e134257e45b3' 
  AND token = '1aMrnm5s0Pgr0bcLaKiEBaTuGOfjg8/HeSYGl236Otg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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