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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8af5653d363f0bbb0af9d1c7a10b08b3c31e5d1fbd60b3b1cab40b23af3e768b' 
  AND token = 'P2XD0Nsbo1fx26+aiJMLYhOwHyyuUFViEngH+yQ25ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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