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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36bb9139eed55b2bf656291a1fa0a5854bc6d657f2244d65a6cdda2f108167b2' 
  AND token = 'QrgSaxEobG/j7KVFClrXjG3tyGttf8+H0g4jWs4uo8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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