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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c93b85715e007ebd573a565c1b1c34b6f8816ee7d34a6e1ae78f7187445ec16f' 
  AND token = 'sWaGtjhultCl2XzriI+/JIjZHxOJsJIcjbeUhC4b5o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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