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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4adaea7b4ddbeb536ad4ee23b9840167ed2d75c72a5a6b5c4f9888572b1066c5' 
  AND token = 'W1mnef3nj232VaFzGJneK27jWqQsajAdGLgL0GkYd64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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