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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06538b65e07f98583f84ceb306e2b7938d930fcdbea434de161b464b9ed0b245' 
  AND token = 'lH97rk/50gx/2Z1FBPL2dYuHm0M/m1ltuJ/sIo/KlsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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