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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '928af7165301adbd88a2e7ff1a66b8e27c3fdc8e2492f24d16017c26406ed844' 
  AND token = 'NEQnHVVyGkFnTC4G7F7zYVBjA0knkto3xIOIafaMNTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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