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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bea14dfb52348e2af35173de4e15e322a05e555cb49d1d7f2f5fbf6045fdc661' 
  AND token = 'cfHSMB57L+SNlHO8WBTEhPA9NESz5UTW2QtY+Z0Douo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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