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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94bf23b52a9250b08862b2220cb520eb7924014eee07a8909c0ed5ec38d8c90b' 
  AND token = 'Y5hN+xUqf920HRn4VTGovDXHysbaRm4zQrDSgqtCChQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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