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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cb7c336000dd5b0db6c92cf595bdf731f8dc08afeffdf6fa69de454b1a83983' 
  AND token = 'UxIJIfgCffcZECN7+qWyQJcy8AcBVPp9A0vhfj7dPsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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