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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4839326c3c71c5d6d881b4edbd7c4591f3d8d398f44a3d59d24805712283dea' 
  AND token = 'LRMlLC8fMfGnHyiHni/1skwNYNLFI12Wmf8IGLsLAbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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