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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fc56760afd6b30a435f13c5d7bbe283d0eab43042522dc523088dc863d21dd5' 
  AND token = 'OAj/3Z7ise5aogZ8n3hGScgms02akW4y9pYDiqrSP04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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