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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd50c11b3fa52c7740d8e0c76292d1ff6c699f4f8af5e3b8aa4ea363c1f613de' 
  AND token = '4cOKL18f32z0oA8cYTUrEYnx7J0yHu3xzwiplN4XADI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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