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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd19d9803b98e868ecceacc07df6d5cf83c53f7ecb008c120ae087d9df7cd4f02' 
  AND token = 'ZtCJdWkZNKdVYP49TcjVomNzPqJtWuJ4f97IkXGXuyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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