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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dcdc3b9660e7cb2f19d5e57630cd888a5e1d9af105fc434bc62eed65f353622' 
  AND token = 'ePziRga5Fxn6QmU3Q8UtXfqniJF36fWfZ17xIZ8+YFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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