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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6968f6b1694680acae9d82cecdceea85d50d2d497391eef571a46079fc7a481f' 
  AND token = 'k28e34vP5YjezcCK6E9jgI9f6Iqp/UkvJxLe3/H3ULc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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