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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42a976f637ebf51b6930571633b1f38ebcb6f50f548a105913d0f2a471443bfe' 
  AND token = 'NpNlUasOTdWUQrEftxAqpNl1ahXfmLlpb3oapfujxMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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