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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6714bb44b13a8f18cd3134706e71c6a3c546e100a748b9def0f5f032d0661fc3' 
  AND token = 'HOMwzxmq3egWtZ5cbOwvMKiOO4c90PNbkbK6m6EZTb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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