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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d018657251d8039f3c224c641f77bcd445e9e396957eddd9280a6569c0ad0de' 
  AND token = 'bHSWwH83JOKvWAJQNTnwPceze5bddvWFSbwNjRrGcw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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