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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba7590dbd92e76ccae163825f14f203980cb0b802cc2828438afd44690c8b306' 
  AND token = 'DwYU2Y0lE2ycJHgMI+ohNd1ERqaf2d+OI1DJzqBtX0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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