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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fa6cc27483e76e37374930a6a05d05997687c9bbb82e95ef63bc0e0b15a9f2c' 
  AND token = 'XYI0cL7cFzDy00G7d4bosKwjTmVBOTV7uBaZR+9Vd70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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