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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd35bf1b8f8519a5ff2e2ceee0f42ee3b5031e99e3cf9e19b56b2a6cdaa618764' 
  AND token = 'cbLH2w6lCDpQxgJSNobaQwL2O7WRPE56kaM4Y5TfHuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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