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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aba4ec209588e10498602a4e0d59d33a93b85448c6b4855a13ef1c26c7ad3783' 
  AND token = 'L4PZuHec7otWakXV+L6Jx8Uhf8e4zmOH7cPCJ0qGaYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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