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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbb1acd25a795ae084bfa469b81c9194bb8bd53925442c417c5504f5148e9000' 
  AND token = 'GUaTk419eBzEos68T3AjVE1fUb7qe17LT0YO2/d15bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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