SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0faa407302d122747e90bd67f91c5bbf18eed98477666a74b99dc47de148e0fe' 
  AND token = 'uzStJWPiHSunr637lXfqRISNGdghQ4jv+kEBd7mDmJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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