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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed97bcce2adc65fff9f811ff5d7b01b5750b88b10e365706c1a10bdb9b12e6bb' 
  AND token = 'vrAE1zHRunw/X5rK6uMpAtfiG7KPBTzVUtoWg1/FIVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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