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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24003786a51776cc2ce1a175313992c8e529108edc501bc44df2806754e43ca1' 
  AND token = 'HP9AlaU6hkW/yT4PP5XuvPRQg42LrGaFMnxeOMSg+TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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