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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20737760a7ebf8cdd00ef2a8a08cad7440cfde6d457a279284e15adc5b9be5e5' 
  AND token = 'szrPzLgMesP7AGAehk5laXCu2byqqTXUn6hQil1RgJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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