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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44ef536aa922b879c18c3b96a01be622f7272b51894306baf2065975a679a4c3' 
  AND token = 'mfGN/LXfUNraR3FrTA0kHQ22SVhcYmBEmrF73/rX7V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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