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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f73ddb9fc85e8f44753de3ae69627a7cc6be84dcbe70536f5823b78ca27e824' 
  AND token = 'KIrXZarpvVNfGdBa6knxsk3cDWZrug4tqo5sCok4FCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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