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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1c455cad8ad406bd3ce22331b60b9df6bf8f88d71f63d9bd204303d5c96fc7e' 
  AND token = 'sL5wLrRsF7XbW3k1kVN/cpWI6479UnLQG9L2uR+AD6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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